1,720,966 research outputs found
New ligand behavior of 4-amino-3-R-1,2,4-Δ2-triazoline-5-thione. Crystal structures of silver(I) [R = H] and copper(I) [R = CH2CH3] complexes
No full textThe molecular structures of [Ag(HL1)2]NO3 and [CuCl(HL2)3] (HL1 = 4-amino-1,2,4-Δ2-triazoline-5-thione; HL2 = 4-amino-3-ethyl-1,2,4-Δ2-triazoline-5-thione) have been determined by single crystal X-ray analyses. Unusual dimeric and polymeric species are present in the silver compound due to the versatile coordination ability of the ligand. The tetrahedral copper(I) complex (C3 symmetry) is chiral owing to the conformational helicoidal disposition of the three S-coordinated triazoline molecules interacting via hydrogen bonds with the coordinated chlorine atom and, in a head-to-tail fashion, with other complexes forming chains running parallel to c. A spontaneous resolution is observed and in the crystal structure only A conformers are present. (C) 2000 Elsevier Science S.A
Dalton communications. Organic nitro compounds as ligands. A comparison between the ligand behaviour of MeNO2 and PhNO2 towards AlCl3
No full textThe crystal-structure analyses of the complexes [AlCl3(RNO2)] (R = Me or Ph) and NMR data in solution suggest a stronger Al-O co-ordinative interaction in the case of nitrobenzene compared to nitromethane; this could account for the dramatic solvent effects observed during certain electrophilic acylation processes involving AlCl3 as a promoter
An example of a nitrogen-bonded arylnitroso complex. The crystal structure of RhCl(NBD)(p-BrC6H4NO)
No full textThe crystal structure of RhCl(NBD)(p-BrC6H4NO) (NBD = norbornadiene) has been detd. by an x-ray diffraction study. The nitroso ligand is σ-(N) bonded. A correlation was found between the values of Δν [ν(N-O)complex-ν(N-O)free ligand] in its IR spectrum and the bonding mode of the nitroso ligands
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
New semiconductors obtained by reaction of 4-imidazoline-2-selone derivatives with TCNQ. Characterization and X-ray structure of (C9H12N4Se)2+ (TCNQ)32-
No full textAppropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
New semiconductors obtained by reaction of 4-imidazoline-2-selone derivatives with TCNQ. Characterization and X-ray structure of (C<SUB>9</SUB>H<SUB>12</SUB>N<SUB>4</SUB>Se)(TCNQ)<SUB>3</SUB>
No full textJ.MATER. CHEM
Synthesis, crystal and molecular structures of the novel compounds 4,7-dithio-5,6-diselenocino-[1,2b:3,4b']-diimidazolyl-1,3,8,10-tetrabutyl 2,9-dithione and -2,9-diselone
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